git.cworth.org Git - apitrace/blob - glstate.cpp

   1 /**************************************************************************
   2  *
   3  * Copyright 2011 Jose Fonseca
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  *
  24  **************************************************************************/
  25
  26
  27 #include <string.h>
  28 #include <iostream>
  29 #include <algorithm>
  30
  31 #include "image.hpp"
  32 #include "json.hpp"
  33 #include "glproc.hpp"
  34 #include "glsize.hpp"
  35 #include "glstate.hpp"
  36
  37
  38 #ifdef __APPLE__
  39
  40 #include <Carbon/Carbon.h>
  41
  42 #ifdef __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 typedef int CGSConnectionID;
  47 typedef int CGSWindowID;
  48 typedef int CGSSurfaceID;
  49
  50 CGLError CGLGetSurface(CGLContextObj, CGSConnectionID*, CGSWindowID*, CGSSurfaceID*);
  51 OSStatus CGSGetSurfaceBounds(CGSConnectionID, CGWindowID, CGSSurfaceID, CGRect *);
  52
  53 #ifdef __cplusplus
  54 }
  55 #endif
  56
  57 #endif /* __APPLE__ */
  58
  59
  60 namespace glstate {
  61
  62
  63 static void
  64 dumpShader(JSONWriter &json, GLuint shader)
  65 {
  66     if (!shader) {
  67         return;
  68     }
  69
  70     GLint shader_type = 0;
  71     glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type);
  72     if (!shader_type) {
  73         return;
  74     }
  75
  76     GLint source_length = 0;
  77     glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &source_length);
  78     if (!source_length) {
  79         return;
  80     }
  81
  82     GLchar *source = new GLchar[source_length];
  83     GLsizei length = 0;
  84     source[0] = 0;
  85     glGetShaderSource(shader, source_length, &length, source);
  86
  87     json.beginMember(enumToString(shader_type));
  88     json.writeString(source);
  89     json.endMember();
  90
  91     delete [] source;
  92 }
  93
  94
  95 static void
  96 dumpShaderObj(JSONWriter &json, GLhandleARB shaderObj)
  97 {
  98     if (!shaderObj) {
  99         return;
 100     }
 101
 102     GLint shader_type = 0;
 103     glGetObjectParameterivARB(shaderObj, GL_OBJECT_TYPE_ARB, &shader_type);
 104     if (!shader_type) {
 105         return;
 106     }
 107
 108     GLint source_length = 0;
 109     glGetObjectParameterivARB(shaderObj, GL_OBJECT_SHADER_SOURCE_LENGTH_ARB, &source_length);
 110     if (!source_length) {
 111         return;
 112     }
 113
 114     GLcharARB *source = new GLcharARB[source_length];
 115     GLsizei length = 0;
 116     source[0] = 0;
 117     glGetShaderSource(shaderObj, source_length, &length, source);
 118
 119     json.beginMember(enumToString(shader_type));
 120     json.writeString(source);
 121     json.endMember();
 122
 123     delete [] source;
 124 }
 125
 126
 127 static inline void
 128 dumpCurrentProgram(JSONWriter &json)
 129 {
 130     GLint program = 0;
 131     glGetIntegerv(GL_CURRENT_PROGRAM, &program);
 132     if (!program) {
 133         return;
 134     }
 135
 136     GLint attached_shaders = 0;
 137     glGetProgramiv(program, GL_ATTACHED_SHADERS, &attached_shaders);
 138     if (!attached_shaders) {
 139         return;
 140     }
 141
 142     GLuint *shaders = new GLuint[attached_shaders];
 143     GLsizei count = 0;
 144     glGetAttachedShaders(program, attached_shaders, &count, shaders);
 145     for (GLsizei i = 0; i < count; ++ i) {
 146        dumpShader(json, shaders[i]);
 147     }
 148     delete [] shaders;
 149 }
 150
 151
 152 static inline void
 153 dumpCurrentProgramObj(JSONWriter &json)
 154 {
 155     GLhandleARB programObj = glGetHandleARB(GL_PROGRAM_OBJECT_ARB);
 156     if (!programObj) {
 157         return;
 158     }
 159
 160     GLint attached_shaders = 0;
 161     glGetProgramivARB(programObj, GL_OBJECT_ATTACHED_OBJECTS_ARB, &attached_shaders);
 162     if (!attached_shaders) {
 163         return;
 164     }
 165
 166     GLhandleARB *shaderObjs = new GLhandleARB[attached_shaders];
 167     GLsizei count = 0;
 168     glGetAttachedObjectsARB(programObj, attached_shaders, &count, shaderObjs);
 169     for (GLsizei i = 0; i < count; ++ i) {
 170        dumpShaderObj(json, shaderObjs[i]);
 171     }
 172     delete [] shaderObjs;
 173 }
 174
 175
 176 static inline void
 177 dumpArbProgram(JSONWriter &json, GLenum target)
 178 {
 179     if (!glIsEnabled(target)) {
 180         return;
 181     }
 182
 183     GLint program_length = 0;
 184     glGetProgramivARB(target, GL_PROGRAM_LENGTH_ARB, &program_length);
 185     if (!program_length) {
 186         return;
 187     }
 188
 189     GLchar *source = new GLchar[program_length + 1];
 190     source[0] = 0;
 191     glGetProgramStringARB(target, GL_PROGRAM_STRING_ARB, source);
 192     source[program_length] = 0;
 193
 194     json.beginMember(enumToString(target));
 195     json.writeString(source);
 196     json.endMember();
 197
 198     delete [] source;
 199 }
 200
 201
 202 static inline void
 203 dumpShaders(JSONWriter &json)
 204 {
 205     json.beginMember("shaders");
 206     json.beginObject();
 207     dumpCurrentProgram(json);
 208     dumpArbProgram(json, GL_FRAGMENT_PROGRAM_ARB);
 209     dumpArbProgram(json, GL_VERTEX_PROGRAM_ARB);
 210     json.endObject();
 211     json.endMember(); //shaders
 212 }
 213
 214
 215 static inline void
 216 dumpTextureImage(JSONWriter &json, GLenum target, GLint level)
 217 {
 218     GLint width, height = 1, depth = 1;
 219
 220     width = 0;
 221     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 222
 223     if (target != GL_TEXTURE_1D) {
 224         height = 0;
 225         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 226         if (target == GL_TEXTURE_3D) {
 227             depth = 0;
 228             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &depth);
 229         }
 230     }
 231
 232     if (width <= 0 || height <= 0 || depth <= 0) {
 233         return;
 234     } else {
 235         char label[512];
 236
 237         GLint active_texture = GL_TEXTURE0;
 238         glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 239         snprintf(label, sizeof label, "%s, %s, level = %i", enumToString(active_texture), enumToString(target), level);
 240
 241         json.beginMember(label);
 242
 243         json.beginObject();
 244
 245         // Tell the GUI this is no ordinary object, but an image
 246         json.writeStringMember("__class__", "image");
 247
 248         json.writeNumberMember("__width__", width);
 249         json.writeNumberMember("__height__", height);
 250         json.writeNumberMember("__depth__", depth);
 251
 252         // Hardcoded for now, but we could chose types more adequate to the
 253         // texture internal format
 254         json.writeStringMember("__type__", "uint8");
 255         json.writeBoolMember("__normalized__", true);
 256         json.writeNumberMember("__channels__", 4);
 257
 258         GLubyte *pixels = new GLubyte[depth*width*height*4];
 259
 260         glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 261
 262         json.beginMember("__data__");
 263         char *pngBuffer;
 264         int pngBufferSize;
 265         Image::writePixelsToBuffer(pixels, width, height, 4, false, &pngBuffer, &pngBufferSize);
 266         json.writeBase64(pngBuffer, pngBufferSize);
 267         free(pngBuffer);
 268         json.endMember(); // __data__
 269
 270         delete [] pixels;
 271         json.endObject();
 272     }
 273 }
 274
 275
 276 static inline void
 277 dumpTexture(JSONWriter &json, GLenum target, GLenum binding)
 278 {
 279     GLint texture_binding = 0;
 280     glGetIntegerv(binding, &texture_binding);
 281     if (!glIsEnabled(target) && !texture_binding) {
 282         return;
 283     }
 284
 285     GLint level = 0;
 286     do {
 287         GLint width = 0, height = 0;
 288         glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 289         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 290         if (!width || !height) {
 291             break;
 292         }
 293
 294         if (target == GL_TEXTURE_CUBE_MAP) {
 295             for (int face = 0; face < 6; ++face) {
 296                 dumpTextureImage(json, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 297             }
 298         } else {
 299             dumpTextureImage(json, target, level);
 300         }
 301
 302         ++level;
 303     } while(true);
 304 }
 305
 306
 307 static inline void
 308 dumpTextures(JSONWriter &json)
 309 {
 310     json.beginMember("textures");
 311     json.beginObject();
 312     GLint active_texture = GL_TEXTURE0;
 313     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 314     GLint max_texture_coords = 0;
 315     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 316     GLint max_combined_texture_image_units = 0;
 317     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 318     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 319     for (GLint unit = 0; unit < max_units; ++unit) {
 320         GLenum texture = GL_TEXTURE0 + unit;
 321         glActiveTexture(texture);
 322         dumpTexture(json, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 323         dumpTexture(json, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 324         dumpTexture(json, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 325         dumpTexture(json, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 326         dumpTexture(json, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 327     }
 328     glActiveTexture(active_texture);
 329     json.endObject();
 330     json.endMember(); // textures
 331 }
 332
 333
 334 static bool
 335 getDrawableBounds(GLint *width, GLint *height) {
 336 #if defined(_WIN32)
 337
 338     HDC hDC = wglGetCurrentDC();
 339     if (!hDC) {
 340         return false;
 341     }
 342
 343     HWND hWnd = WindowFromDC(hDC);
 344     RECT rect;
 345
 346     if (!GetClientRect(hWnd, &rect)) {
 347        return false;
 348     }
 349
 350     *width  = rect.right  - rect.left;
 351     *height = rect.bottom - rect.top;
 352
 353 #elif defined(__APPLE__)
 354
 355     CGLContextObj ctx = CGLGetCurrentContext();
 356     if (ctx == NULL) {
 357         return false;
 358     }
 359
 360     CGSConnectionID cid;
 361     CGSWindowID wid;
 362     CGSSurfaceID sid;
 363
 364     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 365         return false;
 366     }
 367
 368     CGRect rect;
 369
 370     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 371         return false;
 372     }
 373
 374     *width = rect.size.width;
 375     *height = rect.size.height;
 376
 377 #else
 378
 379     Display *display;
 380     Drawable drawable;
 381     Window root;
 382     int x, y;
 383     unsigned int w, h, bw, depth;
 384
 385     display = glXGetCurrentDisplay();
 386     if (!display) {
 387         return false;
 388     }
 389
 390     drawable = glXGetCurrentDrawable();
 391     if (drawable == None) {
 392         return false;
 393     }
 394
 395     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 396         return false;
 397     }
 398
 399     *width = w;
 400     *height = h;
 401
 402 #endif
 403
 404     return true;
 405 }
 406
 407
 408 Image::Image *
 409 getDrawBufferImage(GLenum format) {
 410     GLint channels = __gl_format_channels(format);
 411     if (channels > 4) {
 412         return NULL;
 413     }
 414
 415     GLint width, height;
 416     if (!getDrawableBounds(&width, &height)) {
 417         return NULL;
 418     }
 419
 420     Image::Image *image = new Image::Image(width, height, channels, true);
 421     if (!image) {
 422         return NULL;
 423     }
 424
 425     GLint drawbuffer = GL_NONE;
 426     GLint readbuffer = GL_NONE;
 427     glGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);
 428     glGetIntegerv(GL_READ_BUFFER, &readbuffer);
 429     glReadBuffer(drawbuffer);
 430
 431     glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
 432     glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
 433     glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
 434     glPixelStorei(GL_PACK_ROW_LENGTH, 0);
 435     glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
 436     glPixelStorei(GL_PACK_SKIP_ROWS, 0);
 437     glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
 438     glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
 439     glPixelStorei(GL_PACK_ALIGNMENT, 1);
 440
 441     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, image->pixels);
 442
 443     glPopClientAttrib();
 444
 445     glReadBuffer(readbuffer);
 446
 447     return image;
 448 }
 449
 450
 451 static inline void
 452 dumpDrawBufferImage(JSONWriter &json, GLenum format)
 453 {
 454     GLint channels = __gl_format_channels(format);
 455
 456     GLint width, height;
 457
 458     if (!getDrawableBounds(&width, &height)) {
 459         json.writeNull();
 460     } else {
 461         json.beginObject();
 462
 463         // Tell the GUI this is no ordinary object, but an image
 464         json.writeStringMember("__class__", "image");
 465
 466         json.writeNumberMember("__width__", width);
 467         json.writeNumberMember("__height__", height);
 468         json.writeNumberMember("__depth__", 1);
 469
 470         // Hardcoded for now, but we could chose types more adequate to the
 471         // texture internal format
 472         json.writeStringMember("__type__", "uint8");
 473         json.writeBoolMember("__normalized__", true);
 474         json.writeNumberMember("__channels__", channels);
 475
 476         GLubyte *pixels = new GLubyte[width*height*channels];
 477
 478         GLint drawbuffer = GL_NONE;
 479         GLint readbuffer = GL_NONE;
 480         glGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);
 481         glGetIntegerv(GL_READ_BUFFER, &readbuffer);
 482         glReadBuffer(drawbuffer);
 483
 484         glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
 485         glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
 486         glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
 487         glPixelStorei(GL_PACK_ROW_LENGTH, 0);
 488         glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
 489         glPixelStorei(GL_PACK_SKIP_ROWS, 0);
 490         glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
 491         glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
 492         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 493
 494         glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, pixels);
 495
 496         glPopClientAttrib();
 497         glReadBuffer(readbuffer);
 498
 499         json.beginMember("__data__");
 500         char *pngBuffer;
 501         int pngBufferSize;
 502         Image::writePixelsToBuffer(pixels, width, height, channels, false, &pngBuffer, &pngBufferSize);
 503         //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
 504         //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
 505         json.writeBase64(pngBuffer, pngBufferSize);
 506         free(pngBuffer);
 507         json.endMember(); // __data__
 508
 509         delete [] pixels;
 510         json.endObject();
 511     }
 512 }
 513
 514
 515 static inline GLuint
 516 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
 517                        GLint colorRb, GLint depthRb, GLint stencilRb,
 518                        GLuint *rbs, GLint *numRbs)
 519 {
 520     GLuint fbo;
 521     GLint format;
 522     GLint w, h;
 523
 524     *numRbs = 0;
 525
 526     glGenFramebuffers(1, &fbo);
 527     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 528
 529     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 530     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 531                                  GL_RENDERBUFFER_WIDTH, &w);
 532     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 533                                  GL_RENDERBUFFER_HEIGHT, &h);
 534     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 535                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 536
 537     glGenRenderbuffers(1, &rbs[*numRbs]);
 538     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 539     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 540     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
 541                               GL_RENDERBUFFER, rbs[*numRbs]);
 542
 543     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 544     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 545     glDrawBuffer(drawbuffer);
 546     glReadBuffer(drawbuffer);
 547     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 548                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
 549     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 550     ++*numRbs;
 551
 552     if (stencilRb == depthRb && stencilRb) {
 553         //combined depth and stencil buffer
 554         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 555         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 556                                      GL_RENDERBUFFER_WIDTH, &w);
 557         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 558                                      GL_RENDERBUFFER_HEIGHT, &h);
 559         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 560                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 561
 562         glGenRenderbuffers(1, &rbs[*numRbs]);
 563         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 564         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 565         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 566                                   GL_RENDERBUFFER, rbs[*numRbs]);
 567         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 568         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 569         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 570                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 571         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 572         ++*numRbs;
 573     } else {
 574         if (depthRb) {
 575             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 576             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 577                                          GL_RENDERBUFFER_WIDTH, &w);
 578             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 579                                          GL_RENDERBUFFER_HEIGHT, &h);
 580             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 581                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 582
 583             glGenRenderbuffers(1, &rbs[*numRbs]);
 584             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 585             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 586             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 587                                       GL_DEPTH_ATTACHMENT,
 588                                       GL_RENDERBUFFER, rbs[*numRbs]);
 589             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 590             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 591             glDrawBuffer(GL_DEPTH_ATTACHMENT);
 592             glReadBuffer(GL_DEPTH_ATTACHMENT);
 593             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 594                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
 595             ++*numRbs;
 596         }
 597         if (stencilRb) {
 598             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 599             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 600                                          GL_RENDERBUFFER_WIDTH, &w);
 601             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 602                                          GL_RENDERBUFFER_HEIGHT, &h);
 603             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 604                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 605
 606             glGenRenderbuffers(1, &rbs[*numRbs]);
 607             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 608             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 609             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 610                                       GL_STENCIL_ATTACHMENT,
 611                                       GL_RENDERBUFFER, rbs[*numRbs]);
 612             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 613             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 614             glDrawBuffer(GL_STENCIL_ATTACHMENT);
 615             glReadBuffer(GL_STENCIL_ATTACHMENT);
 616             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 617                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 618             ++*numRbs;
 619         }
 620     }
 621
 622     return fbo;
 623 }
 624
 625
 626 static void
 627 dumpDrawBuffers(JSONWriter &json, GLboolean dumpDepth, GLboolean dumpStencil)
 628 {
 629     json.beginMember("GL_RGBA");
 630     dumpDrawBufferImage(json, GL_RGBA);
 631     json.endMember();
 632
 633     if (dumpDepth) {
 634         json.beginMember("GL_DEPTH_COMPONENT");
 635         dumpDrawBufferImage(json, GL_DEPTH_COMPONENT);
 636         json.endMember();
 637     }
 638
 639     if (dumpStencil) {
 640         json.beginMember("GL_STENCIL_INDEX");
 641         dumpDrawBufferImage(json, GL_STENCIL_INDEX);
 642         json.endMember();
 643     }
 644 }
 645
 646
 647 static void
 648 dumpFramebuffer(JSONWriter &json)
 649 {
 650     json.beginMember("framebuffer");
 651     json.beginObject();
 652
 653     GLint boundDrawFbo = 0, boundReadFbo = 0;
 654     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
 655     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
 656     if (!boundDrawFbo) {
 657         GLint depth_bits = 0;
 658         glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
 659         GLint stencil_bits = 0;
 660         glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
 661         dumpDrawBuffers(json, depth_bits, stencil_bits);
 662     } else {
 663         GLint colorRb, stencilRb, depthRb;
 664         GLint boundRb;
 665         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
 666         GLint drawbuffer = GL_NONE;
 667         glGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);
 668
 669         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
 670                                               drawbuffer,
 671                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 672                                               &colorRb);
 673         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
 674                                               GL_DEPTH_ATTACHMENT,
 675                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 676                                               &depthRb);
 677         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
 678                                               GL_STENCIL_ATTACHMENT,
 679                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 680                                               &stencilRb);
 681
 682         GLint colorSamples, depthSamples, stencilSamples;
 683         GLuint rbs[3];
 684         GLint numRbs = 0;
 685         GLuint fboCopy = 0;
 686         glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 687         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 688                                      GL_RENDERBUFFER_SAMPLES, &colorSamples);
 689         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 690         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 691                                      GL_RENDERBUFFER_SAMPLES, &depthSamples);
 692         glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 693         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 694                                      GL_RENDERBUFFER_SAMPLES, &stencilSamples);
 695         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
 696
 697         if (colorSamples || depthSamples || stencilSamples) {
 698             //glReadPixels doesnt support multisampled buffers so we need
 699             // to blit the fbo to a temporary one
 700             fboCopy = downsampledFramebuffer(boundDrawFbo, drawbuffer,
 701                                              colorRb, depthRb, stencilRb,
 702                                              rbs, &numRbs);
 703         }
 704         glDrawBuffer(drawbuffer);
 705         glReadBuffer(drawbuffer);
 706
 707         dumpDrawBuffers(json, depthRb, stencilRb);
 708
 709         if (fboCopy) {
 710             glBindFramebuffer(GL_FRAMEBUFFER, boundDrawFbo);
 711             glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
 712             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
 713             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
 714             glDeleteRenderbuffers(numRbs, rbs);
 715             glDeleteFramebuffers(1, &fboCopy);
 716         }
 717     }
 718
 719     json.endObject();
 720     json.endMember(); // framebuffer
 721 }
 722
 723
 724 void dumpCurrentContext(std::ostream &os)
 725 {
 726     JSONWriter json(os);
 727     dumpParameters(json);
 728     dumpShaders(json);
 729     dumpTextures(json);
 730     dumpFramebuffer(json);
 731 }
 732
 733
 734 } /* namespace glstate */